If the called side terminal does not support the semantics of bearer service selection, it will respond as if the fallback bearer capability were only the offered bearer capability in applying B.3.3.
If the called side terminal does support the semantics of bearer service selection, and if it is able to accept the call using either of the bearer capabilities (the fallback bearer capability or the preferred bearer capability), then it shall follow B.3.3 procedures in separately evaluating its compatibility with the offered call for each of the offered bearer capabilities (the fallback bearer capability and the preferred bearer capability).
a) If evaluations show the terminal to be compatible with the call, it shall respond to the call using the preferred bearer capability.
b) If the evaluations show the terminal to be incompatible with the call for one of the two offered bearer capabilities (either the fallback bearer capability or the preferred bearer capability), it shall not answer the call using that bearer capability.
c) If both evaluations show the terminal to be incompatible with the call, it shall follow B.3.3 procedures for incompatible calls.